<!DOCTYPE html>
<html lang="en"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>登录</h1>
<p th:text="${msg}" style="color: red"></p>
<form th:action="@{/login}">
    <p>用户名:<input type="text" name="username" placeholder="请输入用户名"></p>
    <p>密码:<input type="text" name="password" placeholder="请输入密码"></p>
    <input type="submit" value="登录">
</form>

</body>
</html>